[1] Univ Malaya, Fac Sci, Plasma Technol Res Ctr, Dept Phys, Kuala Lumpur 50603, Malaysia
[2] Wenzhou Kean Univ, Coll Sci Math & Technol, Dept Biol, Wenzhou 325060, Peoples R China
[3] Kean Univ, Coll Sci Math & Technol, Dept Biol Sci, Union, NJ 07083 USA
[4] Xiamen Univ Malaysia, Dept Phys, Sepang 43900, Selangor, Malaysia